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21#include <linux/rwsem.h>
22#include <linux/f2fs_fs.h>
23#include <linux/security.h>
24#include "f2fs.h"
25#include "xattr.h"
26
27static size_t f2fs_xattr_generic_list(struct dentry *dentry, char *list,
28 size_t list_size, const char *name, size_t name_len, int type)
29{
30 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
31 int total_len, prefix_len = 0;
32 const char *prefix = NULL;
33
34 switch (type) {
35 case F2FS_XATTR_INDEX_USER:
36 if (!test_opt(sbi, XATTR_USER))
37 return -EOPNOTSUPP;
38 prefix = XATTR_USER_PREFIX;
39 prefix_len = XATTR_USER_PREFIX_LEN;
40 break;
41 case F2FS_XATTR_INDEX_TRUSTED:
42 if (!capable(CAP_SYS_ADMIN))
43 return -EPERM;
44 prefix = XATTR_TRUSTED_PREFIX;
45 prefix_len = XATTR_TRUSTED_PREFIX_LEN;
46 break;
47 case F2FS_XATTR_INDEX_SECURITY:
48 prefix = XATTR_SECURITY_PREFIX;
49 prefix_len = XATTR_SECURITY_PREFIX_LEN;
50 break;
51 default:
52 return -EINVAL;
53 }
54
55 total_len = prefix_len + name_len + 1;
56 if (list && total_len <= list_size) {
57 memcpy(list, prefix, prefix_len);
58 memcpy(list + prefix_len, name, name_len);
59 list[prefix_len + name_len] = '\0';
60 }
61 return total_len;
62}
63
64static int f2fs_xattr_generic_get(struct dentry *dentry, const char *name,
65 void *buffer, size_t size, int type)
66{
67 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
68
69 switch (type) {
70 case F2FS_XATTR_INDEX_USER:
71 if (!test_opt(sbi, XATTR_USER))
72 return -EOPNOTSUPP;
73 break;
74 case F2FS_XATTR_INDEX_TRUSTED:
75 if (!capable(CAP_SYS_ADMIN))
76 return -EPERM;
77 break;
78 case F2FS_XATTR_INDEX_SECURITY:
79 break;
80 default:
81 return -EINVAL;
82 }
83 if (strcmp(name, "") == 0)
84 return -EINVAL;
85 return f2fs_getxattr(dentry->d_inode, type, name, buffer, size);
86}
87
88static int f2fs_xattr_generic_set(struct dentry *dentry, const char *name,
89 const void *value, size_t size, int flags, int type)
90{
91 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
92
93 switch (type) {
94 case F2FS_XATTR_INDEX_USER:
95 if (!test_opt(sbi, XATTR_USER))
96 return -EOPNOTSUPP;
97 break;
98 case F2FS_XATTR_INDEX_TRUSTED:
99 if (!capable(CAP_SYS_ADMIN))
100 return -EPERM;
101 break;
102 case F2FS_XATTR_INDEX_SECURITY:
103 break;
104 default:
105 return -EINVAL;
106 }
107 if (strcmp(name, "") == 0)
108 return -EINVAL;
109
110 return f2fs_setxattr(dentry->d_inode, type, name, value, size, NULL);
111}
112
113static size_t f2fs_xattr_advise_list(struct dentry *dentry, char *list,
114 size_t list_size, const char *name, size_t name_len, int type)
115{
116 const char *xname = F2FS_SYSTEM_ADVISE_PREFIX;
117 size_t size;
118
119 if (type != F2FS_XATTR_INDEX_ADVISE)
120 return 0;
121
122 size = strlen(xname) + 1;
123 if (list && size <= list_size)
124 memcpy(list, xname, size);
125 return size;
126}
127
128static int f2fs_xattr_advise_get(struct dentry *dentry, const char *name,
129 void *buffer, size_t size, int type)
130{
131 struct inode *inode = dentry->d_inode;
132
133 if (strcmp(name, "") != 0)
134 return -EINVAL;
135
136 *((char *)buffer) = F2FS_I(inode)->i_advise;
137 return sizeof(char);
138}
139
140static int f2fs_xattr_advise_set(struct dentry *dentry, const char *name,
141 const void *value, size_t size, int flags, int type)
142{
143 struct inode *inode = dentry->d_inode;
144
145 if (strcmp(name, "") != 0)
146 return -EINVAL;
147 if (!inode_owner_or_capable(inode))
148 return -EPERM;
149 if (value == NULL)
150 return -EINVAL;
151
152 F2FS_I(inode)->i_advise |= *(char *)value;
153 return 0;
154}
155
156#ifdef CONFIG_F2FS_FS_SECURITY
157static int __f2fs_setxattr(struct inode *inode, int name_index,
158 const char *name, const void *value, size_t value_len,
159 struct page *ipage);
160static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
161 void *page)
162{
163 const struct xattr *xattr;
164 int err = 0;
165
166 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
167 err = __f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
168 xattr->name, xattr->value,
169 xattr->value_len, (struct page *)page);
170 if (err < 0)
171 break;
172 }
173 return err;
174}
175
176int f2fs_init_security(struct inode *inode, struct inode *dir,
177 const struct qstr *qstr, struct page *ipage)
178{
179 return security_inode_init_security(inode, dir, qstr,
180 &f2fs_initxattrs, ipage);
181}
182#endif
183
184const struct xattr_handler f2fs_xattr_user_handler = {
185 .prefix = XATTR_USER_PREFIX,
186 .flags = F2FS_XATTR_INDEX_USER,
187 .list = f2fs_xattr_generic_list,
188 .get = f2fs_xattr_generic_get,
189 .set = f2fs_xattr_generic_set,
190};
191
192const struct xattr_handler f2fs_xattr_trusted_handler = {
193 .prefix = XATTR_TRUSTED_PREFIX,
194 .flags = F2FS_XATTR_INDEX_TRUSTED,
195 .list = f2fs_xattr_generic_list,
196 .get = f2fs_xattr_generic_get,
197 .set = f2fs_xattr_generic_set,
198};
199
200const struct xattr_handler f2fs_xattr_advise_handler = {
201 .prefix = F2FS_SYSTEM_ADVISE_PREFIX,
202 .flags = F2FS_XATTR_INDEX_ADVISE,
203 .list = f2fs_xattr_advise_list,
204 .get = f2fs_xattr_advise_get,
205 .set = f2fs_xattr_advise_set,
206};
207
208const struct xattr_handler f2fs_xattr_security_handler = {
209 .prefix = XATTR_SECURITY_PREFIX,
210 .flags = F2FS_XATTR_INDEX_SECURITY,
211 .list = f2fs_xattr_generic_list,
212 .get = f2fs_xattr_generic_get,
213 .set = f2fs_xattr_generic_set,
214};
215
216static const struct xattr_handler *f2fs_xattr_handler_map[] = {
217 [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
218#ifdef CONFIG_F2FS_FS_POSIX_ACL
219 [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &f2fs_xattr_acl_access_handler,
220 [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &f2fs_xattr_acl_default_handler,
221#endif
222 [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
223#ifdef CONFIG_F2FS_FS_SECURITY
224 [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
225#endif
226 [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
227};
228
229const struct xattr_handler *f2fs_xattr_handlers[] = {
230 &f2fs_xattr_user_handler,
231#ifdef CONFIG_F2FS_FS_POSIX_ACL
232 &f2fs_xattr_acl_access_handler,
233 &f2fs_xattr_acl_default_handler,
234#endif
235 &f2fs_xattr_trusted_handler,
236#ifdef CONFIG_F2FS_FS_SECURITY
237 &f2fs_xattr_security_handler,
238#endif
239 &f2fs_xattr_advise_handler,
240 NULL,
241};
242
243static inline const struct xattr_handler *f2fs_xattr_handler(int name_index)
244{
245 const struct xattr_handler *handler = NULL;
246
247 if (name_index > 0 && name_index < ARRAY_SIZE(f2fs_xattr_handler_map))
248 handler = f2fs_xattr_handler_map[name_index];
249 return handler;
250}
251
252static struct f2fs_xattr_entry *__find_xattr(void *base_addr, int name_index,
253 size_t name_len, const char *name)
254{
255 struct f2fs_xattr_entry *entry;
256
257 list_for_each_xattr(entry, base_addr) {
258 if (entry->e_name_index != name_index)
259 continue;
260 if (entry->e_name_len != name_len)
261 continue;
262 if (!memcmp(entry->e_name, name, name_len))
263 break;
264 }
265 return entry;
266}
267
268static void *read_all_xattrs(struct inode *inode, struct page *ipage)
269{
270 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
271 struct f2fs_xattr_header *header;
272 size_t size = PAGE_SIZE, inline_size = 0;
273 void *txattr_addr;
274
275 inline_size = inline_xattr_size(inode);
276
277 txattr_addr = kzalloc(inline_size + size, GFP_KERNEL);
278 if (!txattr_addr)
279 return NULL;
280
281
282 if (inline_size) {
283 struct page *page = NULL;
284 void *inline_addr;
285
286 if (ipage) {
287 inline_addr = inline_xattr_addr(ipage);
288 } else {
289 page = get_node_page(sbi, inode->i_ino);
290 if (IS_ERR(page))
291 goto fail;
292 inline_addr = inline_xattr_addr(page);
293 }
294 memcpy(txattr_addr, inline_addr, inline_size);
295 f2fs_put_page(page, 1);
296 }
297
298
299 if (F2FS_I(inode)->i_xattr_nid) {
300 struct page *xpage;
301 void *xattr_addr;
302
303
304 xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
305 if (IS_ERR(xpage))
306 goto fail;
307
308 xattr_addr = page_address(xpage);
309 memcpy(txattr_addr + inline_size, xattr_addr, PAGE_SIZE);
310 f2fs_put_page(xpage, 1);
311 }
312
313 header = XATTR_HDR(txattr_addr);
314
315
316 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
317 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
318 header->h_refcount = cpu_to_le32(1);
319 }
320 return txattr_addr;
321fail:
322 kzfree(txattr_addr);
323 return NULL;
324}
325
326static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
327 void *txattr_addr, struct page *ipage)
328{
329 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
330 size_t inline_size = 0;
331 void *xattr_addr;
332 struct page *xpage;
333 nid_t new_nid = 0;
334 int err;
335
336 inline_size = inline_xattr_size(inode);
337
338 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
339 if (!alloc_nid(sbi, &new_nid))
340 return -ENOSPC;
341
342
343 if (inline_size) {
344 struct page *page = NULL;
345 void *inline_addr;
346
347 if (ipage) {
348 inline_addr = inline_xattr_addr(ipage);
349 } else {
350 page = get_node_page(sbi, inode->i_ino);
351 if (IS_ERR(page)) {
352 alloc_nid_failed(sbi, new_nid);
353 return PTR_ERR(page);
354 }
355 inline_addr = inline_xattr_addr(page);
356 }
357 memcpy(inline_addr, txattr_addr, inline_size);
358 f2fs_put_page(page, 1);
359
360
361 if (hsize <= inline_size) {
362 err = truncate_xattr_node(inode, ipage);
363 alloc_nid_failed(sbi, new_nid);
364 return err;
365 }
366 }
367
368
369 if (F2FS_I(inode)->i_xattr_nid) {
370 xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
371 if (IS_ERR(xpage)) {
372 alloc_nid_failed(sbi, new_nid);
373 return PTR_ERR(xpage);
374 }
375 f2fs_bug_on(new_nid);
376 } else {
377 struct dnode_of_data dn;
378 set_new_dnode(&dn, inode, NULL, NULL, new_nid);
379 xpage = new_node_page(&dn, XATTR_NODE_OFFSET, ipage);
380 if (IS_ERR(xpage)) {
381 alloc_nid_failed(sbi, new_nid);
382 return PTR_ERR(xpage);
383 }
384 alloc_nid_done(sbi, new_nid);
385 }
386
387 xattr_addr = page_address(xpage);
388 memcpy(xattr_addr, txattr_addr + inline_size, PAGE_SIZE -
389 sizeof(struct node_footer));
390 set_page_dirty(xpage);
391 f2fs_put_page(xpage, 1);
392
393
394 F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
395 return 0;
396}
397
398int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
399 void *buffer, size_t buffer_size)
400{
401 struct f2fs_xattr_entry *entry;
402 void *base_addr;
403 int error = 0;
404 size_t value_len, name_len;
405
406 if (name == NULL)
407 return -EINVAL;
408 name_len = strlen(name);
409
410 base_addr = read_all_xattrs(inode, NULL);
411 if (!base_addr)
412 return -ENOMEM;
413
414 entry = __find_xattr(base_addr, name_index, name_len, name);
415 if (IS_XATTR_LAST_ENTRY(entry)) {
416 error = -ENODATA;
417 goto cleanup;
418 }
419
420 value_len = le16_to_cpu(entry->e_value_size);
421
422 if (buffer && value_len > buffer_size) {
423 error = -ERANGE;
424 goto cleanup;
425 }
426
427 if (buffer) {
428 char *pval = entry->e_name + entry->e_name_len;
429 memcpy(buffer, pval, value_len);
430 }
431 error = value_len;
432
433cleanup:
434 kzfree(base_addr);
435 return error;
436}
437
438ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
439{
440 struct inode *inode = dentry->d_inode;
441 struct f2fs_xattr_entry *entry;
442 void *base_addr;
443 int error = 0;
444 size_t rest = buffer_size;
445
446 base_addr = read_all_xattrs(inode, NULL);
447 if (!base_addr)
448 return -ENOMEM;
449
450 list_for_each_xattr(entry, base_addr) {
451 const struct xattr_handler *handler =
452 f2fs_xattr_handler(entry->e_name_index);
453 size_t size;
454
455 if (!handler)
456 continue;
457
458 size = handler->list(dentry, buffer, rest, entry->e_name,
459 entry->e_name_len, handler->flags);
460 if (buffer && size > rest) {
461 error = -ERANGE;
462 goto cleanup;
463 }
464
465 if (buffer)
466 buffer += size;
467 rest -= size;
468 }
469 error = buffer_size - rest;
470cleanup:
471 kzfree(base_addr);
472 return error;
473}
474
475static int __f2fs_setxattr(struct inode *inode, int name_index,
476 const char *name, const void *value, size_t value_len,
477 struct page *ipage)
478{
479 struct f2fs_inode_info *fi = F2FS_I(inode);
480 struct f2fs_xattr_entry *here, *last;
481 void *base_addr;
482 int found, newsize;
483 size_t name_len;
484 __u32 new_hsize;
485 int error = -ENOMEM;
486
487 if (name == NULL)
488 return -EINVAL;
489
490 if (value == NULL)
491 value_len = 0;
492
493 name_len = strlen(name);
494
495 if (name_len > F2FS_NAME_LEN || value_len > MAX_VALUE_LEN(inode))
496 return -ERANGE;
497
498 base_addr = read_all_xattrs(inode, ipage);
499 if (!base_addr)
500 goto exit;
501
502
503 here = __find_xattr(base_addr, name_index, name_len, name);
504
505 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
506 last = here;
507
508 while (!IS_XATTR_LAST_ENTRY(last))
509 last = XATTR_NEXT_ENTRY(last);
510
511 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) +
512 name_len + value_len);
513
514
515 if (value) {
516 int free;
517
518
519
520
521 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
522 if (found)
523 free = free + ENTRY_SIZE(here);
524
525 if (free < newsize) {
526 error = -ENOSPC;
527 goto exit;
528 }
529 }
530
531
532 if (found) {
533
534
535
536
537 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
538 int oldsize = ENTRY_SIZE(here);
539
540 memmove(here, next, (char *)last - (char *)next);
541 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
542 memset(last, 0, oldsize);
543 }
544
545 new_hsize = (char *)last - (char *)base_addr;
546
547
548 if (value) {
549 char *pval;
550
551
552
553
554 memset(last, 0, newsize);
555 last->e_name_index = name_index;
556 last->e_name_len = name_len;
557 memcpy(last->e_name, name, name_len);
558 pval = last->e_name + name_len;
559 memcpy(pval, value, value_len);
560 last->e_value_size = cpu_to_le16(value_len);
561 new_hsize += newsize;
562 }
563
564 error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
565 if (error)
566 goto exit;
567
568 if (is_inode_flag_set(fi, FI_ACL_MODE)) {
569 inode->i_mode = fi->i_acl_mode;
570 inode->i_ctime = CURRENT_TIME;
571 clear_inode_flag(fi, FI_ACL_MODE);
572 }
573
574 if (ipage)
575 update_inode(inode, ipage);
576 else
577 update_inode_page(inode);
578exit:
579 kzfree(base_addr);
580 return error;
581}
582
583int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
584 const void *value, size_t value_len, struct page *ipage)
585{
586 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
587 int err;
588
589 f2fs_balance_fs(sbi);
590
591 f2fs_lock_op(sbi);
592 err = __f2fs_setxattr(inode, name_index, name, value, value_len, ipage);
593 f2fs_unlock_op(sbi);
594
595 return err;
596}
597
